[Fizzban]

The code used in the plugin is:

$query = '';
	foreach ($vbulletin->forumcache AS $fid => $finfo)
	{
		// mark the forum and all child forums read
		$query .= ", ($fid, " . $vbulletin->userinfo['userid'] . ", " . $vbulletin->userinfo['lastactivity'] . ")";
	}

	if ($query)
	{
		$query = substr($query, 2);
		$db->query_write("
			REPLACE INTO " . TABLE_PREFIX . "forumread
				(forumid, userid, readtime)
			VALUES
				$query
		");
	}